Polar-Solvent-Free Sonochemical Synthesis of Mn(II)-Doped CsPbCl₃ Perovskite Nanocrystals for Dual-Color Emission

Abstract

We present a facile, one-step, polar-solvent-free sonochemical synthesis of a series of Mn-doped CsPbCl 3 perovskite nanocrystals (PNCs) by varying the Pb-to-Mn ratio, after which their structure, morphology, and temperature-dependent photoluminescence (PL) properties are investigated. The partial substitution of Pb 2+ with Mn 2+ in CsPbCl 3 PNCs caused lattice contraction without affecting the morphology and structure. All Mn-doped PNCs exhibited dual-wavelength PL profiles, with a weak violet band at around 410 nm attributed to band-edge exciton and a strong orange band at around 596 nm attributed to Mn 2+ : 4 T 1 → 6 A 1 transition, benefited by the exciton-to-Mn 2+ energy transfer. Furthermore, Mn doping increased the PL quantum yield (PLQY) from 5.1% in CsPbCl 3 to 41.14% for 11.8% Mn-doped PNCs as well as decay lifetimes from nanoseconds to milliseconds (long-lived emissive states). Owing to the thermally assisted transition from the exciton to 4 T 1 energy level of Mn 2+ , the temperature-dependent steady-state PL and timeresolved PL spectra of exciton and Mn 2+ in Mn-doped CsPbCl 3 PNCs displayed unusual and contradictory trends. The ultrasonication synthesized Mn-doped PNCs exhibited superior long-term stability, retaining 62% (@ RH 75%) of the initial PL without requiring additional encapsulation. To evaluate the suitable application of Mn-doped CsPbCl 3 PNCs in the white lightemitting diode (w-LED) as a display system, we built a prototype w-LED using blue-, green-, and orange-emitting CsPb(Cl 0.5 / Br 0.5 ) 3 , CsPbBr 3 , and Mn-doped CsPbCl 3 -coated glass slices onto a 20 mA UV LED chip. The constructed prototype w-LED generated bright white light, achieving a luminous efficiency of 76.3 lm/W, color rendering index of 81.4, R9 of 80.1, and a wide color gamut of 101.78% NTSC and 76% BT-2020, demonstrating its promising application in w-LEDs.

All-inorganic copper-halide perovskites for large-Stokes shift and ten-nanosecond-emission scintillators

“…75 Perovskite scintillators in powder form exhibit faster X-ray or scintillation decay times compared to their single crystal or thin film counterparts primarily due to their increased surface area and defect levels. 76,77 The powder form allows for more efficient energy transfer and quicker electron-hole recombination. 78,79 Furthermore, we observed incremental changes in the decay time for the 0D system, where the contribution of t 3 varied from 387.…”

High-throughput preparation of Mn2+-doped CsPbCl3 nanocrystals via a fluidic channel reaction

“…3a) occurred, which were in agreement with the findings that were found in the literature, showing that a valence state of Mn was +2. 39 The elements’ XPS spectra for Cs, Pb and Cl are displayed in Fig. 3b–d, respectively.…”

Mn2+ and Sb3+ Codoped Cs2ZnCl4 Metal Halide with Excitation-Wavelength-Dependent Emission for Fluorescence Anticounterfeiting

“…The PLE spectrum contains multiple bands including UV and blue regions, corresponding to two sets of transitions: 6 A 1 → 4 D and 6 A 1 → 4 G, respectively. The lifetime decay curve of Cs 2 ZnCl 4 :30% Mn 2+ under 361 nm excitation, monitored at 530 nm, can be well fitted using a single-exponential decay (eq 1) 40 = +…”

“…The PLE spectrum contains multiple bands including UV and blue regions, corresponding to two sets of transitions: 6 A 1 → 4 D and 6 A 1 → 4 G, respectively. The lifetime decay curve of Cs 2 ZnCl 4 :30%Mn 2+ under 361 nm excitation, monitored at 530 nm, can be well fitted using a single-exponential decay (eq 1 ) I ( t ) = I 0 + A exp ( − t τ ) where I ( t ) represents the luminescence intensity at time t ; A is a constant; τ represents the decay time. The calculated lifetime value of Cs 2 ZnCl 4 :30%Mn 2+ is 0.89 ms.…”